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Mon, 07 Sep 2020 11:17:56 +0200 From: Laurent Vivier To: qemu-devel@nongnu.org Subject: [PULL 2/5] linux-user: Correctly start brk after executable Date: Mon, 7 Sep 2020 11:17:45 +0200 Message-Id: <20200907091748.376101-3-laurent@vivier.eu> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200907091748.376101-1-laurent@vivier.eu> References: <20200907091748.376101-1-laurent@vivier.eu> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:HLvEtCc5PtWXC2xo7Ndqgm+mYK96AUT4t6eH5zgwKk045TqSoB9 c6h/Un65x8n32V5gK1YPWQVW1DxBfk4s0QF9DWPQx9b9W1p2AxygNz2lTP0Wsfk9LE0BkF+ o1u1lJ0tR2pky9aG1t1rVg697oajUhNWfPSrbkeeXQFsclmot/52DfVE4dYM2TpprR4Fm2n xDvso3j/jof631DVgdliQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:1qbchAxfz4I=:iMPVq6XjzZf2oP1FW46DYE +wzJPWgqCjlaezwMhbc15gskMs9fJeweEBb1RK8PaaYr/xnLU5677u/Yf804hwfz+i3LpXIfk kr3HuZ+brQUvP6cqwZpuu++LNSLoEEt51lLRJw45vjissKiyaARNzkOWes6mnYWZV7Ezh+ZQz pVRFgduJK75QumxgedgrzgzWZWNg/nYjzI9ziOmtZDnYPwTxOC0LsU3XLsHzPldP2Q3c2NQ8k 3/iAxvk0RBoFSntzhyIHB1tCfHVSh6jxhQSn33a1L7ZPhZ/EmAlogkDcwmEvAsMVSR56UolUN enw36cbQkKUksZaQakQoJ+zP5LtUl/8N0KY1n8EaPVt7ezDN/IRpXCQ38H0W+bZK9biwLelEg 5vqolg637i9ph8+G6OQRrS/7tu6pUqKkgZjJl2ut8EAG8n9RL25BFDSJkMfLnfcgjskMhNR+1 6/4VHkxAMfUg5JrcurWTpbAjMeaaQOZKDH0oaQMGmCk9nMglOgSVx+aU44wyf3+sZSmMbKWIm dfsVc4j0f5ScWmD/f5uY0ier758zhzToku3K4dNZmOkjqe1gLnedLNb0YzZdwWPXliBKA8TO7 dtf0aLufeSevupE+lpNB0hTLS/lmWgV4i9bqSy9R/eIYt/Huo7zs462F7oiDIzTMDv2i5dbOX 5jI+pYQjtM+GAfnQnYWbBIuxOh1mKLzjj5+d0pfL5jbm3MEJEpuQyE9gDqVVT5uzuB+h63ebW Q99n9MiFzcb+YfJdLMZAcrRYAFi6NdKR8DhjvGf/zDa9mG6yn9YRuiadpzjSjwT4f43JpWflF QIEIUENTX4j5xmLXd1jUWYOEHd+rMEkUSjK326wWGnf59MfKH4G7E1ia3ZmFZLjHOE7kvsh Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=212.227.126.130; envelope-from=laurent@vivier.eu; helo=mout.kundenserver.de X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/07 05:17:57 X-ACL-Warn: Detected OS = Linux 3.11 and newer X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Timothy E Baldwin , Richard Henderson , Laurent Vivier Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Timothy E Baldwin info->brk was erroneously set to the end of highest addressed writable segment which could result it in overlapping the executable. As per load_elf_binary in fs/binfmt_elf.c in Linux, it should be set to end of highest addressed segment. Signed-off-by: Timothy E Baldwin Reviewed-by: Richard Henderson Message-Id: <20200728224615.326675-1-T.E.Baldwin99@members.leeds.ac.uk> Signed-off-by: Laurent Vivier --- linux-user/elfload.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 04c28cbb9ecb..4961e6119e24 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -2580,9 +2580,9 @@ static void load_elf_image(const char *image_name, in= t image_fd, if (vaddr_ef > info->end_data) { info->end_data =3D vaddr_ef; } - if (vaddr_em > info->brk) { - info->brk =3D vaddr_em; - } + } + if (vaddr_em > info->brk) { + info->brk =3D vaddr_em; } } else if (eppnt->p_type =3D=3D PT_INTERP && pinterp_name) { char *interp_name; @@ -2637,7 +2637,6 @@ static void load_elf_image(const char *image_name, in= t image_fd, if (info->end_data =3D=3D 0) { info->start_data =3D info->end_code; info->end_data =3D info->end_code; - info->brk =3D info->end_code; } =20 if (qemu_log_enabled()) { --=20 2.26.2